/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkStandardPolyDataPainter.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/*
 * Copyright 2004 Sandia Corporation.
 * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
 * license for use of this work by or on behalf of the
 * U.S. Government. Redistribution and use in source and binary forms, with
 * or without modification, are permitted provided that this Notice and any
 * statement of authorship are reproduced on all copies.
 */

#include "vtkStandardPolyDataPainter.h"

#include "vtkActor.h"
#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkConfigure.h"
#include "vtkDataArray.h"
#include "vtkGenericVertexAttributeMapping.h"
#include "vtkInformation.h"
#include "vtkObjectFactory.h"
#include "vtkPainterDeviceAdapter.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkPolygon.h"
#include "vtkProperty.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkShaderDeviceAdapter2.h"
#include "vtkSmartPointer.h"
#include "vtkTimerLog.h"
#include "vtkTriangle.h"

#include <vector>

class vtkStandardPolyDataPainter::vtkInternal
{
public:
  struct vtkInfo
  {
    unsigned int MappingsIndex;
    vtkDataArray* Array;
  };
  typedef std::vector<vtkInfo> InfoVector;
  typedef std::vector<vtkDataArray *> DataArrayVector;
  InfoVector CellAttributesCache;
  InfoVector PointAttributesCache;
  DataArrayVector MultiTextureCoords;
  vtkSmartPointer<vtkGenericVertexAttributeMapping> Mappings;
};

//-----------------------------------------------------------------------------
vtkStandardNewMacro(vtkStandardPolyDataPainter);
//-----------------------------------------------------------------------------
static inline int vtkStandardPolyDataPainterGetTotalCells(vtkPolyData* pd,
  unsigned long typeflags)
{
  int total_cells = 0;
  total_cells += (typeflags & vtkPainter::VERTS)?
    pd->GetNumberOfVerts() : 0;
  total_cells += (typeflags & vtkPainter::LINES)?
    pd->GetNumberOfLines() : 0;
  total_cells += (typeflags & vtkPainter::POLYS)?
    pd->GetNumberOfPolys() : 0;
  total_cells += (typeflags & vtkPainter::STRIPS)?
    pd->GetNumberOfStrips() : 0;
  return total_cells;
}
//-----------------------------------------------------------------------------
vtkStandardPolyDataPainter::vtkStandardPolyDataPainter()
{
  this->Internal = new vtkInternal;
}

//-----------------------------------------------------------------------------
vtkStandardPolyDataPainter::~vtkStandardPolyDataPainter()
{
  delete this->Internal;
}

//-----------------------------------------------------------------------------
void vtkStandardPolyDataPainter::PrintSelf(ostream &os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
}

void vtkStandardPolyDataPainter::AddMultiTextureCoordsArray(vtkDataArray * array)
{
  this->Internal->MultiTextureCoords.push_back(array);
}

//-----------------------------------------------------------------------------
void vtkStandardPolyDataPainter::ProcessInformation(vtkInformation* info)
{
  this->Internal->Mappings = 0;

  if( info->Has(DATA_ARRAY_TO_VERTEX_ATTRIBUTE()) )
  {
    vtkGenericVertexAttributeMapping* collection =
      vtkGenericVertexAttributeMapping::SafeDownCast(
      info->Get(DATA_ARRAY_TO_VERTEX_ATTRIBUTE()));
    this->Internal->Mappings = collection;
  }
}

//-----------------------------------------------------------------------------
void vtkStandardPolyDataPainter::UpdateGenericAttributesCache(
  vtkShaderDeviceAdapter2* shaderDevice2)
{
  if (this->Internal->Mappings)
  {
    vtkPolyData* pd = this->GetInputAsPolyData();
    unsigned int max = this->Internal->Mappings->GetNumberOfMappings();
    for (unsigned int cc=0; cc < max; cc++)
    {
      int field = this->Internal->Mappings->GetFieldAssociation(cc);
      const char *dataArrayName = this->Internal->Mappings->GetArrayName(cc);
      const char *vertexAttributeName =
        this->Internal->Mappings->GetAttributeName(cc);

      if (dataArrayName == NULL)
      {
        continue;
      }

      if (vertexAttributeName == NULL)
      {
        continue;
      }

      vtkDataArray *inArray = NULL;
      vtkInternal::InfoVector* dest=0;

      if (field == vtkDataObject::FIELD_ASSOCIATION_POINTS)
      {
        inArray = pd->GetPointData()->GetArray(dataArrayName);
        dest = &this->Internal->PointAttributesCache;
      }
      else if (field == vtkDataObject::FIELD_ASSOCIATION_CELLS)
      {
        inArray = pd->GetCellData()->GetArray(dataArrayName);
        dest = &this->Internal->CellAttributesCache;
      }

      if (inArray && dest)
      {
        vtkInternal::vtkInfo info;
        info.MappingsIndex = cc;
        info.Array = inArray;
        dest->push_back(info);

        // This caches the attribute index.
        // This is essential since we don't want to call GetAttributeLocation in
        // glBegin()/glEnd().
        if(shaderDevice2)
        {
          shaderDevice2->SendAttribute(vertexAttributeName, 0, 0, 0, 0);
        }
      }
    }
  }
}

//-----------------------------------------------------------------------------
void vtkStandardPolyDataPainter::RenderInternal(vtkRenderer* renderer,
                                                vtkActor* actor,
                                                unsigned long typeflags,
                                                bool forceCompileOnly)
{
  if (typeflags == 0)
  {
    // No primitive to render.
    return;
  }

  if (!renderer->GetRenderWindow()->GetPainterDeviceAdapter())
  {
    vtkErrorMacro("Painter Device Adapter missing!");
    return;
  }
  vtkPolyData* pd = this->GetInputAsPolyData();
  this->TotalCells = vtkStandardPolyDataPainterGetTotalCells(pd, typeflags);
  this->Timer->StartTimer();
  vtkProperty* property = actor->GetProperty();
  vtkIdType startCell = 0;
  int interpolation = property->GetInterpolation();
  vtkShaderDeviceAdapter2* shaderDevice2=0;
  this->Internal->PointAttributesCache.clear();
  this->Internal->CellAttributesCache.clear();
  if(property->GetShading())
  {
    // Preprocess the generic vertex attributes that we need to pass to the
    // shader.
    shaderDevice2 = property->GetShaderDeviceAdapter2();
  }

  if(!shaderDevice2)
  {
    // load the shader device adapator from the information object
    shaderDevice2 =
      vtkShaderDeviceAdapter2::SafeDownCast(
        this->GetInformation()->Get(SHADER_DEVICE_ADAPTOR()));
  }

  if(shaderDevice2)
  {
    shaderDevice2->PrepareForRender();
  }

  this->UpdateGenericAttributesCache(shaderDevice2);

  if (typeflags & vtkPainter::VERTS)
  {
    this->DrawCells(VTK_POLY_VERTEX, pd->GetVerts(), startCell,
                    shaderDevice2, renderer, 0, interpolation);
  }

  startCell += pd->GetNumberOfVerts();
  if (typeflags & vtkPainter::LINES)
  {
    this->DrawCells(VTK_POLY_LINE, pd->GetLines(), startCell,
                    shaderDevice2, renderer, 0, interpolation);
  }

  startCell += pd->GetNumberOfLines();
  if (typeflags & vtkPainter::POLYS)
  {
#if defined(__APPLE__) && defined(VTK_USE_COCOA)
    if (property->GetRepresentation() == VTK_WIREFRAME)
    {
      this->DrawCells(VTK_TETRA, pd->GetPolys(), startCell,
                      shaderDevice2, renderer,
                      this->BuildNormals, interpolation);
    }
    else
#endif
    {
      this->DrawCells(VTK_POLYGON, pd->GetPolys(), startCell,
                      shaderDevice2, renderer,
                      this->BuildNormals, interpolation);
    }
  }

  startCell += pd->GetNumberOfPolys();
  if (typeflags & vtkPainter::STRIPS)
  {
    this->DrawCells(VTK_TRIANGLE_STRIP, pd->GetStrips(), startCell,
                    shaderDevice2, renderer, this->BuildNormals,
                    interpolation);
  }

  this->Timer->StopTimer();
  this->TimeToDraw = this->Timer->GetElapsedTime();

  // let the superclass pass on the request to delegate painter.
  // Ofcouse, more than likely, this call will never have a delegate,
  // but anyways.
  this->Superclass::RenderInternal(renderer, actor, typeflags,forceCompileOnly);


  this->Internal->PointAttributesCache.clear();
  this->Internal->CellAttributesCache.clear();
}

//-----------------------------------------------------------------------------
void vtkStandardPolyDataPainter::DrawCells(
  int mode,
  vtkCellArray *connectivity,
  vtkIdType startCellId,
  vtkShaderDeviceAdapter2 *shaderDevice2,
  vtkRenderer *renderer,
  int buildnormals,
  int interpolation)
{
  vtkPolyData* pd = this->GetInputAsPolyData();

  vtkPainterDeviceAdapter* device = renderer->GetRenderWindow()->
    GetPainterDeviceAdapter();

  vtkCellData* cellData = pd->GetCellData();
  vtkPointData* pointData = pd->GetPointData();
  vtkUnsignedCharArray* fieldColors = vtkArrayDownCast<vtkUnsignedCharArray>(
    pd->GetFieldData()->GetArray("Color"));

  int disable_scalar_color = 0;
  if (this->Information->Has(DISABLE_SCALAR_COLOR()) &&
    this->Information->Get(DISABLE_SCALAR_COLOR())==1)
  {
    disable_scalar_color = 1;
  }
  if (disable_scalar_color)
  {
    fieldColors = 0;
  }

  vtkPoints* p = pd->GetPoints();
  vtkIdType npts, *pts;
  vtkIdType cellId = startCellId;
  vtkIdType fielddata_cellId = startCellId;

  int pointtype = p->GetDataType();
  void* voidpoints = p->GetVoidPointer(0);
  int count = 0;
  double polyNorm[3];
  vtkIdType normIdx[3];
  if (buildnormals)
  {
    // check is normals are present in data. if so, no need to build them.
    // Point normals can be used only when interpolation is not VTK_FLAT.
    // When interpolation == VTK_FLAT and cell normals are absent,
    // cell normals may be built (depending on this->BuildNormals).
    buildnormals = ((pointData->GetNormals() && interpolation != VTK_FLAT) ||
      cellData->GetNormals())? 0 : 1;
  }

  // skip scalars if disable_scalar_color is true.
  int start_attribute = (disable_scalar_color? 1 : 0);

  // get attribute mask
  int cell_attribute_mask = 0;
  for(int attribii = start_attribute; attribii < vtkCellData::NUM_ATTRIBUTES;
      attribii++)
  {
      if(device->IsAttributesSupported(attribii))
      {
          cell_attribute_mask = cell_attribute_mask | (1 << attribii);
      }
  }

  int point_attribute_mask = 0;
  for(int attribii = start_attribute; attribii < vtkPointData::NUM_ATTRIBUTES;
      attribii++)
  {
      if(device->IsAttributesSupported(attribii))
      {
          point_attribute_mask = point_attribute_mask | (1 << attribii);
      }
  }


  // Note that cell attributes are overridden by point attributes.
  for (connectivity->InitTraversal(); connectivity->GetNextCell(npts, pts); count++)
  {
    int attribii;

    device->BeginPrimitive(mode);

    // SEND CELL ATTRIBUTES
    for (attribii = start_attribute; attribii < vtkCellData::NUM_ATTRIBUTES;
         attribii++)
    {
        if (!((cell_attribute_mask >> attribii) & 1))
        {
        // skip non-renderable attributes.
        continue;
        }
      vtkDataArray *a = cellData->GetAttribute(attribii);
      if (a == NULL)
      {
        continue;
      }
      int numc = a->GetNumberOfComponents();
      device->SendAttribute(attribii, numc, a->GetDataType(),
        a->GetVoidPointer(numc*cellId));
    }
    if (buildnormals)
    {
      if (mode == VTK_POLYGON)
      {
        vtkPolygon::ComputeNormal(p, npts, pts, polyNorm);
      }
      else // VTK_TRIANGLE_STRIP
      {
        vtkTriangle::ComputeNormal(p, 3, pts, polyNorm);
      }
      device->SendAttribute(vtkDataSetAttributes::NORMALS, 3,
        VTK_DOUBLE, polyNorm);
    }

    if (fieldColors)
    {
      // fieldColors are same as cell colors except when rendering
      // VTK_TRIANGLE_STRIP, when they represent triangle colors.
      int numc = fieldColors->GetNumberOfComponents();
      device->SendAttribute(vtkCellData::SCALARS, numc, VTK_UNSIGNED_CHAR,
        fieldColors->GetVoidPointer(numc * fielddata_cellId));
      fielddata_cellId++;
    }

    // Send generic attributes associated with the cell. Shaders style 2.
    vtkInternal::InfoVector::iterator gaIter =
        this->Internal->CellAttributesCache.begin();
    for (; shaderDevice2 && gaIter != this->Internal->CellAttributesCache.end(); ++gaIter)
    {
      vtkDataArray* a = gaIter->Array;
      unsigned int mappingsIndex = gaIter->MappingsIndex;
      int numc = a->GetNumberOfComponents();
      int siComp = this->Internal->Mappings->GetComponent(mappingsIndex);
      // if siComp==-1, then all components of the array are sent,
      // otherwise only the chosen component is sent.
      shaderDevice2->SendAttribute(
        this->Internal->Mappings->GetAttributeName(mappingsIndex),
        (siComp>=0)? 1: numc,
        a->GetDataType(),
        (siComp>=0) ? a->GetVoidPointer(numc*cellId+siComp) :
        a->GetVoidPointer(numc*cellId));
    }

    for (vtkIdType cellpointi = 0; cellpointi < npts; cellpointi++)
    {
      vtkIdType pointId = pts[cellpointi];
      // If using field colors, then we must send tringle colors,
      // if rendering triangle strips.
      if (fieldColors && mode == VTK_TRIANGLE_STRIP && cellpointi > 2)
      {
        int numc = fieldColors->GetNumberOfComponents();
        device->SendAttribute(vtkCellData::SCALARS, numc, VTK_UNSIGNED_CHAR,
          fieldColors->GetVoidPointer(numc * fielddata_cellId));
        fielddata_cellId++;
      }

      // SEND POINT ATTRIBUTES.
      // Send point centered attributes.
      for (attribii = start_attribute; attribii < vtkPointData::NUM_ATTRIBUTES;
           attribii++)
      {
        if (!((point_attribute_mask >> attribii) & 1))
        {
          // skip non-renderable attributes.
          continue;
        }
        vtkDataArray *a = pointData->GetAttribute(attribii);
        if (!a || attribii == vtkPointData::VECTORS ||
          (interpolation == VTK_FLAT && attribii == vtkPointData::NORMALS))
        {
          // Point normals are skipped when interpolation is flat.
          // We may want to add an interpolation painter that does this.
          continue;
        }

        int numc = a->GetNumberOfComponents();
        device->SendAttribute(attribii, numc, a->GetDataType(),
          a->GetVoidPointer(numc*pointId));
      }

      if (buildnormals && mode == VTK_TRIANGLE_STRIP && cellpointi >=2)
      {
        // build the normal for each triangle in a tstrip.
        if (cellpointi % 2)
        {
          normIdx[0] = pts[cellpointi-2]; normIdx[1] = pts[cellpointi];
          normIdx[2] = pts[cellpointi-1];
          vtkTriangle::ComputeNormal(p, 3, normIdx, polyNorm);
        }
        else
        {
          normIdx[0] = pts[cellpointi-2]; normIdx[1] = pts[cellpointi-1];
          normIdx[2] = pts[cellpointi];
          vtkTriangle::ComputeNormal(p, 3, normIdx, polyNorm);
        }

        device->SendAttribute(vtkDataSetAttributes::NORMALS, 3,
          VTK_DOUBLE, polyNorm);
      }

      // Send generic attributes associated with the point. Shader style 2.
      gaIter = this->Internal->PointAttributesCache.begin();
      for (; shaderDevice2 && gaIter !=
        this->Internal->PointAttributesCache.end(); ++gaIter)
      {
        vtkDataArray* a = gaIter->Array;
        unsigned int mappingsIndex = gaIter->MappingsIndex;
        int numc = a->GetNumberOfComponents();
        int siComp = this->Internal->Mappings->GetComponent(mappingsIndex);
        // if siComp==-1, then all components of the array are sent,
        // otherwise only the chosen component is sent.
        shaderDevice2->SendAttribute(
          this->Internal->Mappings->GetAttributeName(mappingsIndex),
          (siComp>=0)? 1: numc,
          a->GetDataType(),
          (siComp>=0) ? a->GetVoidPointer(numc*pointId+siComp) :
          a->GetVoidPointer(numc*pointId));
      }

      // Check for any multitexture attributes and send them.
      gaIter = this->Internal->PointAttributesCache.begin();
      for (; gaIter != this->Internal->PointAttributesCache.end(); ++gaIter)
      {
        vtkDataArray* a = gaIter->Array;
        unsigned int mappingsIndex = gaIter->MappingsIndex;
        int numc = a->GetNumberOfComponents();
        int siComp = this->Internal->Mappings->GetComponent(mappingsIndex);
        int textureIndex = this->Internal->Mappings->GetTextureUnit(mappingsIndex);

        if(textureIndex >= 0)
        {
          device->SendMultiTextureCoords(
            (siComp>=0)? 1: numc,
            a->GetDataType(),
            a->GetVoidPointer(0),
            textureIndex,
            numc*pointId
            );
        }
      }

      //vtkInformationVector *inArrayVec =
      //  this->Information->Get(vtkAlgorithm::INPUT_ARRAYS_TO_PROCESS());
      //int numArrays = inArrayVec->GetNumberOfInformationObjects();

      //for(int i = 0; i < numArrays; i++)
      //  {
      //  //this->
      //  }


      device->SendAttribute(vtkPointData::NUM_ATTRIBUTES, 3,
        pointtype, voidpoints, 3*pointId);
    }
    device->EndPrimitive();

    cellId++;

    if (count == 10000)
    {
      count = 0;
      // report progress
      this->UpdateProgress(static_cast<double>(cellId - startCellId)/this->TotalCells);
      // Abort render.
      if (renderer->GetRenderWindow()->CheckAbortStatus())
      {
        return;
      }
    }
  }
}